Sartorius Muscle - Origin, Insertion, Innervation & Actions - Anatomy | Kenhub

The sartorius muscle is a long, thin, superficial muscle of the thigh, which is involved in flexion of the thigh at the hip joint, and rotation of the leg at the knee joint. Learn more about this and other anterior thigh muscles on our website: https://khub.me/zwwn6

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The origin of the sartorius muscle is at the anterior superior iliac spine of the pelvic bone. From there, it courses spirally towards the knee region. Its insertion is at the pes anserinus, found medially, on the tibial tuberosity.

1:24 Origin & insertion
1:55 Innervation
2:10 Actions/Functions

The sartorius muscle is a biarticular muscle, in that it moves both the hip and knee joints.
At the hip joint, contraction of this muscle results in flexion of the hip joint. In addition, it is involved in the abduction and outward, or lateral rotation of the hip joint.
At the knee joint, it forces a flexion and inward, or medial rotation. The flexion movement is the result of the tendon inserting at the knee joint behind the flexion-extension axis.

When all five of the movements mentioned here are executed simultaneously, the legs would cross like in a tailor seat. Therefore, the “tailor’s muscle” is most easily palpable in this position.

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Read more on the sartorius muscle, and check its functions in 3D in this article: https://khub.me/4gjec

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